Question

1) how does reflection differ from diffraction?

Answer 1

Answer: (1) The correct answer is A.

(2) The correct answer is D.

Explanation:

(1)

Reflection is the sending back of light from the surface without absorbing it. In the reflection phenomenon, the wave does not continue moving forward.

Diffraction is the bending of the light around the obstacle. In the diffraction phenomenon, the wave travels forward after striking around the obstacle.

Therefore, the correct answer is A.

(2)

Amplitude is the maximum displacement in the medium from the rest position.

The amount of energy is related to the amplitude. Amplitude is related to the amount of energy carried by the wave. Low energy wave is characterized by a low amplitude. High energy wave is characterized by a high amplitude.

Therefore, the correct option is D.

Answer 2

(1) Option (A) is correct. Reflection is the only process in which the wave does not continue moving forward.

(2) Option D are correct.  Amplitude is related to the amount of energy carried by the wave as well as the maximum displacement from the rest position.

Further Explanation:

Part (1):

Reflection is defined as the phenomenon of bending of light in which the wave bounces back off the surface and changes its direction. Thus, does not continue to move further.

On the other hand, Diffraction is the process whose keen cause is the bending of the wave through small obstacles (which are comparable to wavelength of the wave) after which the wave always continues to move further.  

Further, with reflection, the phenomenon like the diffraction and the interference are also defined by the change in the intensity of the wave that is observed on the screen for subsequent fringes. And the phenomenon of refraction also takes place in the mechanical waves (e.g. in the Rope of variable diameter, at the point of change in diameter both refraction and reflection takes place), also diffraction takes place in sound waves which are also mechanical waves.

Lastly, with reflection, refraction is also defined by the change in the direction of the light ray as they either bend towards or away from the normal line as the light rays enters into the different mediums.

Part (2):

The amplitude is related to the amount of the energy carried by the wave and is given as:

$\boxed{E=kA^2}$

Here, $E$ is the energy carried by the wave, $k$ is the wave number and $A$ is the amplitude of the wave.

Further, the amplitude is defined as the maximum magnitude of the oscillating physical quantity associated with the wave. (e.g. If a particle is oscillating then its displacement is the function of time and is a repetitive variable, so the maximum value of displacement is called as amplitude.)

Therefore, option D are correct.  Amplitude is related to the amount of energy carried by the wave as well as the maximum displacement from the rest position.

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Answer Details:

Grade: High School

Subject: Physics

Chapter: Optics

Keywords:

Reflection, refraction, diffraction, interference, light, light ray, light wave, mechanical waves, sound, bending of light, obstacle, amplitude, maximum displacement, rest, energy carried by the wave, change in the direction.